Method of preparing tobermorite from fly ash and application thereof

A tobermorite and fly ash technology, applied in the directions of alkaline earth metal silicate, silicate, etc., can solve problems such as environmental pollution, and achieve better mass transfer effect, better mass transfer effect and low energy consumption. Effect

Active Publication Date: 2015-08-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention can effectively alleviate the problem of environmen...

Method used

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  • Method of preparing tobermorite from fly ash and application thereof
  • Method of preparing tobermorite from fly ash and application thereof
  • Method of preparing tobermorite from fly ash and application thereof

Examples

Experimental program
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Embodiment 1

[0027] The raw material of this embodiment is ordinary fly ash, which contains 29.77% Al 2 o 3 and 43.66% SiO 2 . The above-mentioned ordinary fly ash and calcium hydroxide were combined by CaO / SiO 2 The molar ratio is 0.4 ingredients, soluble in Na 2 In the lye with an O concentration of 0.1g / L, the solid-to-liquid ratio is controlled to be 1:40, and the slurry is subjected to a synthesis reaction in a reactor at a reaction temperature of 250°C and a reaction time of 3 hours. After the reaction, the slurry is subjected to vacuum Suction filtration, tobermolite wet residue is obtained, its appearance is as follows figure 2 As shown; the slag phase obtained after suction filtration is pressed into shape with a selected mold; finally, the molded product is dried at 110°C for 3 hours, and the bulk density of the molded material is 349kg / m 3 , The compressive strength is 2.10MPa, and the linear shrinkage rate is 0.50%.

Embodiment 2

[0029] The raw material of this embodiment is common fly ash, which contains 20.85% Al 2 o 3 and 45.78% SiO 2 . The above-mentioned ordinary fly ash and calcium oxide were combined with CaO / SiO 2 The molar ratio is 1.0 ingredients, soluble in Na 2 In the lye with an O concentration of 88g / L, the solid-to-liquid ratio is controlled to be 1:20, and the slurry is synthesized in a reactor at a reaction temperature of 220°C and a reaction time of 10 hours. After the reaction, the slurry is vacuum pumped Filter to obtain wet slag of tobermolite; after suction filtration, the slag phase obtained is pressed and molded with a selected mold; finally, the molded product is dried at 100°C for 5 hours, and the bulk density of the molded material is 208kg / m 3 , the compressive strength is 1.38MPa, the thermal conductivity is 0.060W / (m·k), and the linear shrinkage is 0.58%.

Embodiment 3

[0031] The raw material of this embodiment is ordinary fly ash, which contains 27.05% Al 2 o 3 and 39.97% SiO 2 . The above-mentioned ordinary fly ash and carbide slag were combined with CaO / SiO 2 The molar ratio is 1.4 ingredients, soluble in Na 2 In the lye with an O concentration of 8g / L, the solid-to-liquid ratio is controlled to be 1:30, and the slurry is synthesized in a reactor at a reaction temperature of 220°C and a reaction time of 12 hours. After the reaction, the slurry is vacuum pumped Filtration to obtain tobermolite wet slag; the slag phase obtained after suction filtration was pressed and molded with a selected mold; finally, the molded product was dried at 50°C for 15 hours, and the bulk density of the molded material was 369kg / m 3 , The compressive strength is 2.01MPa.

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Abstract

The invention belongs to the field of recycle of solid wastes, and particularly, relates to a method of preparing tobermorite from fly ash and an application thereof. The method comprises following steps: (1) material preparation: mixing the fly ash and a calcium raw material with a molar ratio of CaO to SiO2 being 0.4-1.4 to prepare a mixed material, and dissolving the mixed material in an alkaline solution according to the ratio of 1:10-1:40 to obtain a mixed slurry material; (2) reaction: performing a synthetic reaction in a sealed container to the mixed slurry material at 100-250 DEG C for 3-30 h, and filtering a reaction product to obtain tobermorite wet residue. A press-moulded product of the tobermorite is low in volume weight and is excellent in performance. Compared with a conventional method in which the tobermorite is synthesized through an autoclaved curing process with a silicon raw material and a calcium raw material, the method is better in mass transfer of the reaction process so that the method is lower in energy consumption.

Description

technical field [0001] The invention belongs to the field of solid waste reuse, in particular, the invention relates to a method for preparing tobermolite from fly ash and its application. Background technique [0002] According to public information reports, every ton of coal burned can produce 250-300kg of fly ash. Since the founding of the People's Republic of China, the total amount of fly ash that has not been utilized and has been piled up in ash yards has exceeded 2.5 billion tons. It is estimated that my country's fly ash emissions will increase from 480 million tons in 2010 to 580 million tons in 2015. Ton. Usually fly ash is processed by making bricks, building roads, producing cement, and improving soil. However, these utilization methods cannot completely absorb the huge amount of fly ash in our country, thus causing a large amount of fly ash to accumulate and causing great pressure on the environment. [0003] However, tobermullite is a kind of hydrated calciu...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 马淑花吕松青郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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